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/* request-key.c: hand a key request off to the appropriate process
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* /sbin/request-key <op> <key> <uid> <gid> <threadring> <processring> <sessionring> [<info>]
*
* Searches the specified session ring for a key indicating the command to run:
* type: "user"
* desc: "request-key:<op>"
* data: command name, eg: "/home/dhowells/request-key-create.sh"
*/
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <signal.h>
#include <syslog.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <sys/select.h>
#include <sys/wait.h>
#include "keyutils.h"
static int xdebug;
static int xnolog;
static char *xkey;
static char *xuid;
static char *xgid;
static char *xthread_keyring;
static char *xprocess_keyring;
static char *xsession_keyring;
static char conffile[256];
static int confline;
static int norecurse;
static void lookup_action(char *op,
key_serial_t key,
char *ktype,
char *kdesc,
char *callout_info)
__attribute__((noreturn));
static void execute_program(char *op,
key_serial_t key,
char *ktype,
char *kdesc,
char *callout_info,
char *cmdline)
__attribute__((noreturn));
static void pipe_to_program(char *op,
key_serial_t key,
char *ktype,
char *kdesc,
char *callout_info,
char *prog,
char **argv)
__attribute__((noreturn));
static int match(const char *pattern, int plen, const char *datum, int dlen);
static void debug(const char *fmt, ...) __attribute__((format(printf, 1, 2)));
static void debug(const char *fmt, ...)
{
va_list va;
if (xdebug) {
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
if (!xnolog) {
openlog("request-key", 0, LOG_AUTHPRIV);
va_start(va, fmt);
vsyslog(LOG_DEBUG, fmt, va);
va_end(va);
closelog();
}
}
}
static void error(const char *fmt, ...) __attribute__((noreturn, format(printf, 1, 2)));
static void error(const char *fmt, ...)
{
va_list va;
if (xdebug) {
va_start(va, fmt);
vfprintf(stderr, fmt, va);
va_end(va);
}
if (!xnolog) {
openlog("request-key", 0, LOG_AUTHPRIV);
va_start(va, fmt);
vsyslog(LOG_ERR, fmt, va);
va_end(va);
closelog();
}
exit(1);
}
#define file_error(FMT, ...) error("%s: "FMT, conffile, ## __VA_ARGS__)
#define line_error(FMT, ...) error("%s:%d: "FMT, conffile, confline, ## __VA_ARGS__)
static void oops(int x)
{
error("Died on signal %d", x);
}
/*****************************************************************************/
/*
*
*/
int main(int argc, char *argv[])
{
key_serial_t key;
char *ktype, *kdesc, *buf, *callout_info;
int ret, ntype, dpos, n, fd;
if (argc == 2 && strcmp(argv[1], "--version") == 0) {
printf("request-key from %s (Built %s)\n",
keyutils_version_string, keyutils_build_string);
return 0;
}
signal(SIGSEGV, oops);
signal(SIGBUS, oops);
signal(SIGPIPE, SIG_IGN);
for (;;) {
if (argc > 1 && strcmp(argv[1], "-d") == 0) {
xdebug++;
argv++;
argc--;
}
else if (argc > 1 && strcmp(argv[1], "-n") == 0) {
xnolog = 1;
argv++;
argc--;
}
else
break;
}
if (argc != 8 && argc != 9)
error("Unexpected argument count: %d\n", argc);
fd = open("/dev/null", O_RDWR);
if (fd < 0)
error("open");
if (fd > 2) {
close(fd);
}
else if (fd < 2) {
ret = dup(fd);
if (ret < 0)
error("dup failed: %m\n");
if (ret < 2 && dup(fd) < 0)
error("dup failed: %m\n");
}
xkey = argv[2];
xuid = argv[3];
xgid = argv[4];
xthread_keyring = argv[5];
xprocess_keyring = argv[6];
xsession_keyring = argv[7];
key = atoi(xkey);
/* assume authority over the key
* - older kernel doesn't support this function
*/
ret = keyctl_assume_authority(key);
if (ret < 0 && !(argc == 9 || errno == EOPNOTSUPP))
error("Failed to assume authority over key %d (%m)\n", key);
/* ask the kernel to describe the key to us */
if (xdebug < 2) {
ret = keyctl_describe_alloc(key, &buf);
if (ret < 0)
goto inaccessible;
}
else {
buf = strdup("user;0;0;1f0000;debug:1234");
}
/* extract the type and description from the key */
debug("Key descriptor: \"%s\"\n", buf);
ntype = -1;
dpos = -1;
n = sscanf(buf, "%*[^;]%n;%*d;%*d;%x;%n", &ntype, &n, &dpos);
if (n != 1)
error("Failed to parse key description\n");
ktype = buf;
ktype[ntype] = 0;
kdesc = buf + dpos;
debug("Key type: %s\n", ktype);
debug("Key desc: %s\n", kdesc);
/* get hold of the callout info */
callout_info = argv[8];
if (!callout_info) {
void *tmp;
if (keyctl_read_alloc(KEY_SPEC_REQKEY_AUTH_KEY, &tmp) < 0)
error("Failed to retrieve callout info (%m)\n");
callout_info = tmp;
}
debug("CALLOUT: '%s'\n", callout_info);
/* determine the action to perform */
lookup_action(argv[1], /* op */
key, /* ID of key under construction */
ktype, /* key type */
kdesc, /* key description */
callout_info /* call out information */
);
inaccessible:
error("Key %d is inaccessible (%m)\n", key);
} /* end main() */
/*****************************************************************************/
/*
* determine the action to perform
*/
static void lookup_action(char *op,
key_serial_t key,
char *ktype,
char *kdesc,
char *callout_info)
{
char buf[4096 + 2], *p, *q;
FILE *conf;
int len, oplen, ktlen, kdlen, cilen;
oplen = strlen(op);
ktlen = strlen(ktype);
kdlen = strlen(kdesc);
cilen = strlen(callout_info);
/* search the config file for a command to run */
if (strlen(ktype) <= sizeof(conffile) - 30) {
if (xdebug < 2)
snprintf(conffile, sizeof(conffile) - 1,
"/etc/request-key.d/%s.conf", ktype);
else
snprintf(conffile, sizeof(conffile) - 1,
"request-key.d/%s.conf", ktype);
conf = fopen(conffile, "r");
if (conf)
goto opened_conf_file;
if (errno != ENOENT)
error("Cannot open %s: %m\n", conffile);
}
if (xdebug < 2)
snprintf(conffile, sizeof(conffile) - 1, "/etc/request-key.conf");
else
snprintf(conffile, sizeof(conffile) - 1, "request-key.conf");
conf = fopen(conffile, "r");
if (!conf)
error("Cannot open %s: %m\n", conffile);
opened_conf_file:
debug("Opened config file '%s'\n", conffile);
for (confline = 1;; confline++) {
/* read the file line-by-line */
if (!fgets(buf, sizeof(buf), conf)) {
if (feof(conf))
error("Cannot find command to construct key %d\n", key);
file_error("error %m\n");
}
len = strlen(buf);
if (len >= sizeof(buf) - 2)
line_error("Line too long\n");
/* ignore blank lines and comments */
if (len == 1 || buf[0] == '#' || isspace(buf[0]))
continue;
buf[--len] = 0;
p = buf;
/* attempt to match the op */
q = p;
while (*p && !isspace(*p)) p++;
if (!*p)
goto syntax_error;
*p = 0;
if (!match(q, p - q, op, oplen))
continue;
p++;
/* attempt to match the type */
while (isspace(*p)) p++;
if (!*p)
goto syntax_error;
q = p;
while (*p && !isspace(*p)) p++;
if (!*p)
goto syntax_error;
*p = 0;
if (!match(q, p - q, ktype, ktlen))
continue;
p++;
/* attempt to match the description */
while (isspace(*p)) p++;
if (!*p)
goto syntax_error;
q = p;
while (*p && !isspace(*p)) p++;
if (!*p)
goto syntax_error;
*p = 0;
if (!match(q, p - q, kdesc, kdlen))
continue;
p++;
/* attempt to match the callout info */
while (isspace(*p)) p++;
if (!*p)
goto syntax_error;
q = p;
while (*p && !isspace(*p)) p++;
if (!*p)
goto syntax_error;
*p = 0;
if (!match(q, p - q, callout_info, cilen))
continue;
p++;
debug("%s:%d: Line matches\n", conffile, confline);
/* we've got an action */
while (isspace(*p)) p++;
if (!*p)
goto syntax_error;
fclose(conf);
execute_program(op, key, ktype, kdesc, callout_info, p);
}
file_error("No matching action\n");
syntax_error:
line_error("Syntax error\n");
} /* end lookup_action() */
/*****************************************************************************/
/*
* attempt to match a datum to a pattern
* - one asterisk is allowed anywhere in the pattern to indicate a wildcard
* - returns true if matched, false if not
*/
static int match(const char *pattern, int plen, const char *datum, int dlen)
{
const char *asterisk;
int n;
debug("match(%*.*s,%*.*s)\n", plen, plen, pattern, dlen, dlen, datum);
asterisk = memchr(pattern, '*', plen);
if (!asterisk) {
/* exact match only if no wildcard */
if (plen == dlen && memcmp(pattern, datum, dlen) == 0)
goto yes;
goto no;
}
/* the datum mustn't be shorter than the pattern without the asterisk */
if (dlen < plen - 1)
goto no;
n = asterisk - pattern;
if (n == 0) {
/* wildcard at beginning of pattern */
pattern++;
if (!*pattern)
goto yes; /* "*" matches everything */
/* match the end of the datum */
plen--;
if (memcmp(pattern, datum + (dlen - plen), plen) == 0)
goto yes;
goto no;
}
/* need to match beginning of datum for "abc*" and "abc*def" */
if (memcmp(pattern, datum, n) != 0)
goto no;
if (!asterisk[1])
goto yes; /* "abc*" matches */
/* match the end of the datum */
asterisk++;
n = plen - n - 1;
if (memcmp(pattern, datum + (dlen - n), n) == 0)
goto yes;
no:
debug(" = no\n");
return 0;
yes:
debug(" = yes\n");
return 1;
} /* end match() */
/*****************************************************************************/
/*
* execute a program to deal with a key
*/
static void execute_program(char *op,
key_serial_t key,
char *ktype,
char *kdesc,
char *callout_info,
char *cmdline)
{
char *argv[256];
char *prog, *p, *q;
int argc, pipeit;
debug("execute_program('%s','%s')\n", callout_info, cmdline);
/* if the commandline begins with a bar, then we pipe the callout data into it and read
* back the payload data
*/
pipeit = 0;
if (cmdline[0] == '|') {
pipeit = 1;
cmdline++;
}
/* extract the path to the program to run */
prog = p = cmdline;
while (*p && !isspace(*p)) p++;
// if (!*p)
// line_error("No command path\n");
// *p++ = 0;
if (*p)
*p++ = 0;
argv[0] = strrchr(prog, '/') + 1;
/* extract the arguments */
for (argc = 1; p; argc++) {
while (isspace(*p)) p++;
if (!*p)
break;
if (argc >= 254)
line_error("Too many arguments\n");
argv[argc] = q = p;
while (*p && !isspace(*p)) p++;
if (*p)
*p++ = 0;
else
p = NULL;
debug("argv[%d]: '%s'\n", argc, argv[argc]);
if (*q != '%')
continue;
/* it's a macro */
q++;
if (!*q)
line_error("Missing macro name\n");
if (*q == '%') {
/* it's actually an anti-macro escape "%%..." -> "%..." */
argv[argc]++;
continue;
}
/* single character macros */
if (!q[1]) {
switch (*q) {
case 'o': argv[argc] = op; continue;
case 'k': argv[argc] = xkey; continue;
case 't': argv[argc] = ktype; continue;
case 'd': argv[argc] = kdesc; continue;
case 'c': argv[argc] = callout_info; continue;
case 'u': argv[argc] = xuid; continue;
case 'g': argv[argc] = xgid; continue;
case 'T': argv[argc] = xthread_keyring; continue;
case 'P': argv[argc] = xprocess_keyring; continue;
case 'S': argv[argc] = xsession_keyring; continue;
default:
line_error("Unsupported macro\n");
}
}
/* keysub macro */
if (*q == '{') {
key_serial_t keysub;
void *tmp;
char *ksdesc, *end, *subdata;
int ret, loop;
/* extract type and description */
q++;
ksdesc = strchr(q, ':');
if (!ksdesc)
line_error("Keysub macro lacks ':'\n");
*ksdesc++ = 0;
end = strchr(ksdesc, '}');
if (!end)
line_error("Unterminated keysub macro\n");
*end++ = 0;
if (*end)
line_error("Keysub macro has trailing rubbish\n");
debug("Keysub: %s key \"%s\"\n", q, ksdesc);
if (!q[0])
line_error("Keysub type empty\n");
if (!ksdesc[0])
line_error("Keysub description empty\n");
/* look up the key in the requestor's keyrings, but fail immediately if the
* key is not found rather than invoking /sbin/request-key again
*/
keysub = request_key(q, ksdesc, NULL, 0);
if (keysub < 0)
line_error("Keysub key not found: %m\n");
ret = keyctl_read_alloc(keysub, &tmp);
if (ret < 0)
line_error("Can't read keysub %d data: %m\n", keysub);
subdata = tmp;
for (loop = 0; loop < ret; loop++)
if (!isprint(subdata[loop]))
error("keysub %d data not printable ('%02hhx')\n",
keysub, subdata[loop]);
argv[argc] = subdata;
continue;
}
}
if (argc == 0)
line_error("No arguments\n");
argv[argc] = NULL;
if (xdebug) {
char **ap;
debug("%s %s\n", pipeit ? "PipeThru" : "Run", prog);
for (ap = argv; *ap; ap++)
debug("- argv[%td] = \"%s\"\n", ap - argv, *ap);
}
/* become the same UID/GID as the key requesting process */
//setgid(atoi(xuid));
//setuid(atoi(xgid));
/* if the last argument is a single bar, we spawn off the program dangling on the end of
* three pipes and read the key material from the program, otherwise we just exec
*/
if (pipeit)
pipe_to_program(op, key, ktype, kdesc, callout_info, prog, argv);
/* attempt to execute the command */
execv(prog, argv);
line_error("Failed to execute '%s': %m\n", prog);
} /* end execute_program() */
/*****************************************************************************/
/*
* pipe the callout information to the specified program and retrieve the payload data over another
* pipe
*/
static void pipe_to_program(char *op,
key_serial_t key,
char *ktype,
char *kdesc,
char *callout_info,
char *prog,
char **argv)
{
char errbuf[512], payload[32768 + 1], *pp, *pc, *pe;
int ipi[2], opi[2], epi[2], childpid;
int ifl, ofl, efl, npay, ninfo, espace, tmp;
debug("pipe_to_program(%s -> %s)", callout_info, prog);
if (pipe(ipi) < 0 || pipe(opi) < 0 || pipe(epi) < 0)
error("pipe failed: %m");
childpid = fork();
if (childpid == -1)
error("fork failed: %m");
if (childpid == 0) {
/* child process */
if (dup2(ipi[0], 0) < 0 ||
dup2(opi[1], 1) < 0 ||
dup2(epi[1], 2) < 0)
error("dup2 failed: %m");
close(ipi[0]);
close(ipi[1]);
close(opi[0]);
close(opi[1]);
close(epi[0]);
close(epi[1]);
execv(prog, argv);
line_error("Failed to execute '%s': %m\n", prog);
}
/* parent process */
close(ipi[0]);
close(opi[1]);
close(epi[1]);
#define TOSTDIN ipi[1]
#define FROMSTDOUT opi[0]
#define FROMSTDERR epi[0]
ifl = fcntl(TOSTDIN, F_GETFL);
ofl = fcntl(FROMSTDOUT, F_GETFL);
efl = fcntl(FROMSTDERR, F_GETFL);
if (ifl < 0 || ofl < 0 || efl < 0)
error("fcntl/F_GETFL failed: %m");
ifl |= O_NONBLOCK;
ofl |= O_NONBLOCK;
efl |= O_NONBLOCK;
if (fcntl(TOSTDIN, F_SETFL, ifl) < 0 ||
fcntl(FROMSTDOUT, F_SETFL, ofl) < 0 ||
fcntl(FROMSTDERR, F_SETFL, efl) < 0)
error("fcntl/F_SETFL failed: %m");
ninfo = strlen(callout_info);
pc = callout_info;
npay = sizeof(payload);
pp = payload;
espace = sizeof(errbuf);
pe = errbuf;
do {
fd_set rfds, wfds;
FD_ZERO(&rfds);
FD_ZERO(&wfds);
if (TOSTDIN != -1) {
if (ninfo > 0) {
FD_SET(TOSTDIN, &wfds);
}
else {
close(TOSTDIN);
TOSTDIN = -1;
continue;
}
}
if (FROMSTDOUT != -1)
FD_SET(FROMSTDOUT, &rfds);
if (FROMSTDERR != -1)
FD_SET(FROMSTDERR, &rfds);
tmp = TOSTDIN > FROMSTDOUT ? TOSTDIN : FROMSTDOUT;
tmp = tmp > FROMSTDERR ? tmp : FROMSTDERR;
tmp++;
debug("select r=%d,%d w=%d m=%d\n", FROMSTDOUT, FROMSTDERR, TOSTDIN, tmp);
tmp = select(tmp, &rfds, &wfds, NULL, NULL);
if (tmp < 0)
error("select failed: %m\n");
if (TOSTDIN != -1 && FD_ISSET(TOSTDIN, &wfds)) {
tmp = write(TOSTDIN, pc, ninfo);
if (tmp < 0) {
if (errno != EPIPE)
error("write failed: %m\n");
debug("EPIPE");
ninfo = 0;
}
else {
debug("wrote %d\n", tmp);
pc += tmp;
ninfo -= tmp;
}
}
if (FROMSTDOUT != -1 && FD_ISSET(FROMSTDOUT, &rfds)) {
tmp = read(FROMSTDOUT, pp, npay);
if (tmp < 0)
error("read failed: %m\n");
debug("read %d\n", tmp);
if (tmp == 0) {
close(FROMSTDOUT);
FROMSTDOUT = -1;
}
else {
pp += tmp;
npay -= tmp;
if (npay == 0)
error("Too much data read from query program\n");
}
}
if (FROMSTDERR != -1 && FD_ISSET(FROMSTDERR, &rfds)) {
char *nl;
tmp = read(FROMSTDERR, pe, espace);
if (tmp < 0)
error("read failed: %m\n");
debug("read err %d\n", tmp);
if (tmp == 0) {
close(FROMSTDERR);
FROMSTDERR = -1;
continue;
}
pe += tmp;
espace -= tmp;
while ((nl = memchr(errbuf, '\n', pe - errbuf))) {
int n, rest;
nl++;
n = nl - errbuf;
if (xdebug)
fprintf(stderr, "Child: %*.*s", n, n, errbuf);
if (!xnolog) {
openlog("request-key", 0, LOG_AUTHPRIV);
syslog(LOG_ERR, "Child: %*.*s", n, n, errbuf);
closelog();
}
rest = pe - nl;
if (rest > 0) {
memmove(errbuf, nl, rest);
pe -= n;
espace += n;
}
else {
pe = errbuf;
espace = sizeof(errbuf);
}
}
if (espace == 0) {
int n = sizeof(errbuf);
if (xdebug)
fprintf(stderr, "Child: %*.*s", n, n, errbuf);
if (!xnolog) {
openlog("request-key", 0, LOG_AUTHPRIV);
syslog(LOG_ERR, "Child: %*.*s", n, n, errbuf);
closelog();
}
pe = errbuf;
espace = sizeof(errbuf);
}
}
} while (TOSTDIN != -1 || FROMSTDOUT != -1 || FROMSTDERR != -1);
/* wait for the program to exit */
if (waitpid(childpid, &tmp, 0) != childpid)
error("wait for child failed: %m\n");
/* if the process exited non-zero or died on a signal, then we call back in to ourself to
* decide on negation
* - this is not exactly beautiful but the quickest way of having configurable negation
* settings
*/
if (WIFEXITED(tmp) && WEXITSTATUS(tmp) != 0) {
if (norecurse)
error("child exited %d\n", WEXITSTATUS(tmp));
norecurse = 1;
debug("child exited %d\n", WEXITSTATUS(tmp));
lookup_action("negate", key, ktype, kdesc, callout_info);
}
if (WIFSIGNALED(tmp)) {
if (norecurse)
error("child died on signal %d\n", WTERMSIG(tmp));
norecurse = 1;
debug("child died on signal %d\n", WTERMSIG(tmp));
lookup_action("negate", key, ktype, kdesc, callout_info);
}
/* attempt to instantiate the key */
debug("instantiate with %td bytes\n", pp - payload);
if (keyctl_instantiate(key, payload, pp - payload, 0) < 0)
error("instantiate key failed: %m\n");
debug("instantiation successful\n");
exit(0);
} /* end pipe_to_program() */
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